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# Ken Kousen

> Ken Kousen is a Java Champion, author of seven technical books, and a trainer and speaker on Java, Kotlin, Spring, Gradle, Android, and practical AI/LLM integration. He runs Kousen IT, Inc., teaches at Trinity College, and publishes the weekly "Tales from the jar side" newsletter and YouTube channel. Contact: ken.kousen@kousenit.com

## Books
- [Claude Code: Up and Running](https://www.kousenit.com/publications/claude-code-up-and-running/): agentic coding with Claude Code (O'Reilly, Early Release — 10 of 11 chapters available)
- [Mockito Made Clear](https://www.kousenit.com/publications/mockito-made-clear/): Mockito / testing (Pragmatic Bookshelf)
- [Help Your Boss Help You](https://www.kousenit.com/publications/help-your-boss-help-you/): managing up for technical pros (Pragmatic Bookshelf)
- [Kotlin Cookbook](https://www.kousenit.com/publications/kotlin-cookbook/): Kotlin recipes (O'Reilly)
- [Modern Java Recipes](https://www.kousenit.com/publications/modern-java-recipes/): modern/functional Java (O'Reilly)
- [Gradle Recipes for Android](https://www.kousenit.com/publications/gradle-recipes-for-android/): Gradle for Android (O'Reilly)
- [Making Java Groovy](https://www.kousenit.com/publications/making-java-groovy/): the Groovy/Java intersection (Manning)

## Projects
- [MockHub](https://github.com/kousen/mockhub): A concert-ticket marketplace that doubles as a teaching platform for AI integration (Model Context Protocol). (live: https://mockhub.kousenit.com)
- [certificate-service](https://github.com/kousen/certificate-service): Generates a digitally-signed PDF 'certificate of ownership' for Ken's books. (live: https://certificate-service.kousenit.com)
- [lyrics_trainer](https://github.com/kousen/lyrics_trainer): A simple app for learning song lyrics. (live: https://kousen.github.io/lyrics_trainer/)
- [GeminiMcpServer](https://github.com/kousen/GeminiMcpServer): Wraps Gemini 2.5 Flash in a Model Context Protocol server.
- [OsqueryMcpServer](https://github.com/kousen/OsqueryMcpServer): An MCP wrapper (and Claude Code skill) for osquery system diagnostics.
- [gh_mcp_server](https://github.com/kousen/gh_mcp_server): An MCP wrapper for the GitHub gh command-line tool.

## Training materials
- [Claude Code](https://github.com/kousen/claude-code-training): Slides and demos for Ken's training course on Claude Code.
- [Codex CLI](https://github.com/kousen/codex-training): Slides and exercises for Ken's training course on OpenAI's Codex CLI.
- [Antigravity](https://github.com/kousen/gemini-training): Course materials for Google Antigravity. (Repo is still named gemini-training; materials updated, repo not yet renamed.)
- [Spring AI](https://github.com/kousen/Spring_AI_Training_Course): Exercises and solutions for Ken's training course on Spring AI.
- [LangChain4j](https://github.com/kousen/LangChain4j_Training_course): Exercises and code for Ken's training course on the LangChain4j framework.

## Recent newsletter issues
- [Tales from the jar side: Glasgow conference, Jev = $$?, Book is done, and the usual Social Media posts](https://kenkousen.substack.com/p/tales-from-the-jar-side-glasgow-conference)
- [Tales from the jar side: The bitter lesson, A chess tournament, Community over Code, New AI stuff, and the usual Social Media posts](https://kenkousen.substack.com/p/tales-from-the-jar-side-the-bitter)
- [Tales from the jar side: New video about Claude Code with any model, Some stats about my job, and the usual Social Media gags](https://kenkousen.substack.com/p/tales-from-the-jar-side-new-video)
- [Tales from the jar side: My Claude Code book, Stranger New Worlds, Jev and other AI stuff, and the usual Social Media silliness](https://kenkousen.substack.com/p/tales-from-the-jar-side-my-claude)
- [Tales from the jar side: Star Trek week, OpenAI and the Millennium prize, AI Slop license, and the usual social media silliness](https://kenkousen.substack.com/p/tales-from-the-jar-side-star-trek-f07)
- [Tales from the jar side: NVIDIA buys Hugging Face, Coding agent status lights, AI for academic success, Space Madness, and the usual Social Media posts](https://kenkousen.substack.com/p/tales-from-the-jar-side-nvidia-buys)

## Recent videos
- [How I Use Any AI Model With Claude Code (Full Setup)](https://www.youtube.com/watch?v=gb2X5feZNak)
- [I "Distilled" Claude for $1.61 — Here's What Actually Transferred](https://www.youtube.com/watch?v=vd0K9_Ez1kU)
- [I stopped hating UI tests (here's why)](https://www.youtube.com/watch?v=-wyHSKOCZXs)
- [I Created a Working Star Trek Computer (Full Java Stack)](https://www.youtube.com/watch?v=q8sXNXR6iKc)
- [RAG Fundamentals: Hands on with LangChain, Spring AI, & LangChain4j](https://www.youtube.com/watch?v=3kMwv7Kraxk)
- [When One Agent Isn’t Enough: Experiments with Multi-Agent AI](https://www.youtube.com/watch?v=ywh2KGDUv08)

## Links
- [Newsletter (Tales from the jar side)](https://kenkousen.substack.com)
- [YouTube (Tales from the jar side)](https://youtube.com/@talesfromthejarside)
- [Blog (Stuff I've Learned Recently)](https://kousenit.org)
- [GitHub](https://github.com/kousen)
- [LinkedIn](https://www.linkedin.com/in/kenkousen/)
- [Bluesky](https://bsky.app/profile/kousenit.com)